23645421 has 6 divisors (see below), whose sum is σ = 34154510. Its totient is φ = 15763608.

The previous prime is 23645417. The next prime is 23645441. The reversal of 23645421 is 12454632.

23645421 is a `hidden beast` number, since 236 + 4 + 5 + 421 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23474025 + 171396 = 4845^2 + 414^2 .

It is not a de Polignac number, because 23645421 - 2² = 23645417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23645441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1313626 + ... + 1313643.

Almost surely, 2^23645421 is an apocalyptic number.

It is an amenable number.

23645421 is a deficient number, since it is larger than the sum of its proper divisors (10509089).

23645421 is a wasteful number, since it uses less digits than its factorization.

23645421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627275 (or 2627272 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 23645421 is about 4862.6557558602. The cubic root of 23645421 is about 287.0223286703.

The spelling of 23645421 in words is "twenty-three million, six hundred forty-five thousand, four hundred twenty-one".